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I have 18 character long IDs I get from an API, and I currently store them as varchar(20). They are used as primary and foreign keys. Is it better in my case, to use bigint instead of a string type, performance-wise?

Since JavaScript cannot deal with bigints, they are converted by default to string, but I could set columns to be bigint, if that will help.

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    In common joining/referencing by bigint is more safe than that by varchar. So storing your IDs as a common unique attribute and using bigint synthetic primary (and foreign) key may be more appropriate.
    – Akina
    Nov 5 '18 at 9:35
  • Why is it more safe? I would say it is slightly more efficient.. with both types you can have missing values if you don’t enforce FKs.
    – eckes
    Nov 5 '18 at 11:04
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Definitely store as a bigint: this uses 8 bytes, while an 18 character string uses 19 bytes.

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